Wedge jack



June 16, 1925.

H. H. LAMPERT wanes JACK Filed April 16. 1924 ill I IL Patented June 16,1925.

' UNITED STATES HENRY H. LAHPERT, OI CHICAGO, ILLINOIS.

wanes not.

I Application flied April 16, 1924. Serial No: 706,955.

To all whom it may concern:

Be it known that I, HENRY H. LAMPER'I, a citizen ofthe United States-of America, and a resident of Chicago, county of Cook, and State of Illinois, have invented a new and useful Improvement in Wedge Jacks, of which the following is a specification.

This invention relates to a jack particularly suitable for adjusting shores or props in building construction or in excavating work. The objects of this invention are to provide a jack conveniently arranged for adjustably supporting a post or shore so as to vertically form a continuation of the shore timber, and to provide, in addition,

for its convenient and rapid adjustment in corners .of the shore timber.

bars lare connected together by a lattice length, and to provide an improved jack construction of this type allowing for both a rapid, coarse adjustment or setting of the shore, to be followed by a fine adjustment as the load comes on or as the work progresses. It is also the object of this invention to provide an economical and highly useful jack particularly designed for use in supportin temporary forms for concrete floors or buildings or for bracing walls in excavation work.

The objects of this invention are accomplished by the construction shown in the drawing in which:

Fig. 1 is a side elevation of the improved 'ack. Fi 2 and 3 are respectively fragmentary detai s in side and elevation, illustrating the action of the wedge in making a fine adjustment'of the length of the shore.

The construction as illustrated comprises a vertically extending frame member adapted to receive rectangular posts commonly employed for the shores of a building. This frame member is preferably formed of vertically extending angle bars to embrace the These angle work on one end and the lower ends by riveting to a flange casting 2 forming a head proper of the jack. This casting is pro# bar 6. Through the center of the post 4 is cut a rectan ular slot 7 in which is fitted a wedge 8. he wedge is provided with a series of holes 9'which register with the side of the post or with the. holes in the post. Notches 11 in the an le bars 1 provide means for supporting a T- ar shelf 12.. The ends 'of the wedge 8 are provided with stop bars 13. i In operation the shore 2 is placed in the rectangular jack frameand supported upon the T.-bar member thereby securing a coarse adjustment of the total length of the shore, then the wedge 8 can be tapped with a light sledge at either end making a quick adjustment and a very close adjustment of the total height of the shore. When this adjustment has once been made a pin 14: can

be slipped in place securing the wedge at any desired position. The natural position of the pin is at the small end of the wedge next to the post. The stops at the ends of the wedge limit the total action of the wedge, but the means for supporting the ibar shelf are located at pre-determined positions representing about two adjustments for one movement of the wedge. The stops provided at the top of the circular support and at the ends of the wedge prevent the loss of parts in movement and in transportation.

this invention has beenherein shown and described, it will be understood that numerous details of the construction shown may be altered or omitted without departing from the spirit of this invention as defined by the following claims.

I claim:

1. A jack comprising a hollow rectangular frame structure formed of a plurality of vertical angle irons, said angle irons being tied together by a rectangular collar and attached at their lower ends by a supporting castin to which angle irons are secured, a centra 1y located aperture in said casting, a post fitting said aperture in said casting and a supporting base for said post and having swivel connection. to said post, a slot in said post, a wedge coacting with the base of said slot and -the supporting casting till? means for locking said wedge in pre-deand said casting, stops on said post and said termined positions, a shelf in said rectanguwedge, a rectangular shore' timber socket lar frame and means for holding said shelf. built on said casting, and a shelf supported '10 '2. An improved jack comprisin a base, a in said socket. 6 slotted post having swivel connection to said Signed at Chicago this 8th day of April base, a casting with an a erture tp fit said 1924. 7 ost, a wedge co-acting tween said slot HENRY H. LAMPERT. 

